<?hh // strict
/**
 * Copyright (c) 2014, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the "hack" directory of this source tree.
 *
 *
 */

function test(bool $b): ?bool {
  $x = $b ? null : false;
  $y = $b ? false : null;
  return $x;
}
